瞬态类氖铁x射线激光抽运脉冲结构的优化计算

Optimization of drive pulse configuration for transient Ne like Fe x ray laser

利用一维拉格朗日流体动力学模拟程序对由纳秒预脉冲和皮秒主脉冲相结合而成的抽运脉冲组合 ,产生瞬态类氖铁x射线激光 (2 5 5nm ,3p→ 3s,J=0→ 1 )的过程进行了优化计算 .通过对抽运脉冲组合的强度、宽度、脉冲间隔等参数的优化计算 ,得到了在预脉冲将靶物质充分电离到类氖离化态的前提下 (类氖离子丰度 >80 %) ,在主预脉冲峰值之间的脉冲间隔为零时 ,产生有效增益的条件是最好的 .

Numerical simulation of transient Ne like Fe (25 5nm,3p→3s, J =0→1) x ray laser pumped by a nanosecond prepulse followed by a picosecond main pulse is performed, using a one dimensional hydrodynamic code in this paper. The effects of the pumping laser pulse intensity, duration and pulse delay are studied. The results indicate that under the pre condition of maximum population of Ne like ion abundance (over 80%), a maximum gain can be generated, when the main pulse is superposed on the peak of the prepulse.